Also, the FB/BF knots in row 4 and 14 are unnecessary and I’d recommend replacing them with backwards/forwards knots so the lengths of all your strings remain even,
For my bracelet, I used 90 cm per string, so 180 cm folded in half. I made a 15 cm bracelet and I don’t plan to do ties at the end and I had 20 cm remaining. I’d recommend using 80 cm per string and adding more if you want to do ties.